Lec21-Gravitation

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1、PhysicsIClass21Newton’sTheoryofGravitationForcesinNatureForcesinPhysics1(sofar)Newton’sTheoryofGravitationPropertiesofGravityNewton’sLawofUniversalGravitationrWhereDoesg=9.8m/s2FitIn?GravityisaConservativeForceMmFdRTwoFormulasforGravitationalPotentialEnergy!Take-AwayConceptsProb

2、lemsoftheDayProblemsoftheDayOptional-Kepler’sLawsofOrbitsKepler’sThreeLawsofPlanetaryMotion1.TheLawofOrbits:AllplanetsmoveinellipticalorbitshavingtheSunatonefocus.2.TheLawofAreas:AlinejoininganyplanettotheSunsweepsoutequalareasinequaltimes.3.TheLawofPeriods:Thesquareoftheperiodo

3、fanyplanetabouttheSunisproportionaltothecubeofthesemi-majoraxisofitsorbit.Kepler’sThreeLawsofPlanetaryMotionTheLawofAreasTheLawofPeriodsENERGYINCIRCULARORBITSOptional-GeneralRelativityAlbertEinsteinWhereDidNewtonGoWrong?(Again!)ThePrincipleofEquivalenceThePrincipleofEquivalenceG

4、eneralTheoryofRelativityBlackHolesIfNewton’sGravityisn’ttrue,whydowestilluseit?MassiveBlackHolesInGalaxiesNGC3377,NGC3379AndNGC4486B